method chaining

1
2class Arithmetic {
3  constructor() {
4    this.value = 0;
5  }
6  sum(...args) {
7    this.value = args.reduce((sum, current) => sum + current, 0);
8    return this;
9  }
10  add(value) {
11    this.value = this.value + value;
12    return this;
13  }
14  subtract(value) {
15    this.value = this.value - value;
16    return this;
17  }
18  average(...args) {
19    this.value = args.length
20      ? (this.sum(...args).value) / args.length
21      : undefined;
22    return this;
23  }
24}
25
26a = new Arithmetic()
27a.sum(1, 3, 6)   // => { value: 10 } 
28  .subtract(3)   // => { value: 7 }
29  .add(4)        // => { value: 11 }
30  .value         // => 11 
31
32// Console Output
33// 11

1String methods can be combined in a process called method chaining. 
2Given word = 'JavaScript';, word.toUpperCase() returns JAVASCRIPT. 
3What would word.slice(4).toUpperCase() return?
4

1given() ....   --> RequestSpecification 
2     .header  accept() contentType()
3     .queryParam
4     .pathParam
5     .body
6     .log
7     .auth..
8when()       --->> RequestSender
9   .get() ------>> Response Object 
10   .post()
11   .put()
12   .delete()
13then()      -----> ValidatableResponse  
14        This is where assertion happen 
15    .statusCode
16    .header   accept() contentType()
17    .body( matchers goes here)
18    .log
19